I'd get a springer extended mag release, I like the paddle and I prefer the Gray Guns trigger, because it's the only one that I've tried and it feels great, it's noticeably better than the stock trigger. If you feel like the grip doesn't have enough bite, you could go the stipple route or silicon carbide, personally the legion grip had enough bite for me so I left it alone. Lastly a tungsten guide rod, I think the gun is already balanced pretty well, I had a tungsten guide rod from an older X5, it was a little flatter with the tungsten guide rod, I don't think it's super necessary. Biggest improvements were trigger and the paddle mag release for me.